How to override commands in the Revit UI (when you REALLY don't want people to import CAD files)

The previous post showed how to delete CAD imports that are already in your Revit model. What if you want to prevent those CAD imports from being added in the first place?

The 2013 API introduced functionality that allows commands in the Revit UI to be replaced with your API code. In this simple case, the Import command will be replaced with an error dialog.

You will need to find the ID for the command that you want to replace. The easiest way to do that is to execute the command through the Revit UI and then open the Revit journal file (in C:\Users\HP002\AppData\Local\Autodesk\Revit\Autodesk Revit Architecture 2013\Journals or something like that). For import, the entry will be

 Jrn.Command "Internal" , "Import vector data from other programs , ID_FILE_IMPORT"

The string in capital letters near the end of the line is the command id. Here’s the code showing how to replace the Import command, and in the video you see that while Link still works as usual, Import does not.

private void Module_Startup(object sender, EventArgs e)
{
    UIApplication uiapp = new UIApplication(this.Application);

    // Get the command id for the import command
    RevitCommandId commandId = RevitCommandId.LookupCommandId("ID_FILE_IMPORT");

    // use try/catch because CreateAddInCommandBinding will throw if there is already a binding for this id
    // for more info see http://boostyourbim.wordpress.com/2013/01/06/using-module_startup-to-run-macro-code-when-revit-starts/
    try
    {
        AddInCommandBinding importBinding = uiapp.CreateAddInCommandBinding(commandId);
        importBinding.Executed += new EventHandler<Autodesk.Revit.UI.Events.ExecutedEventArgs>(importReplacement);
    }
    catch
    {}
}

private void importReplacement(object sender, Autodesk.Revit.UI.Events.ExecutedEventArgs arg)
{
    TaskDialog.Show("Stop!","Do not import!");
}

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